I have a 2007 f150 5.4l 3 valve with 221k Miles I got a week ago. Ive always owned diesels so I'm new to the gas truck world. So the problem I'm having is sometimes very randomly not specific to any speed at all the truck will feel somewhat like it drops a cylinder or has a misfire. Best way to describe It is that it's like driving on a bumpy road. And it gets worse the more throttle you give it, but it only last 30 seconds at the most and then it stops. Truck also seems to be low on power but i know the 5.4s are dogs anyway. If someone knows what the problem is or has the same one please let me know ASAP